package com.yex.utils.security;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import javax.crypto.Cipher;
import javax.crypto.Mac;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;

/**
 * @Author: 袁晓钧
 * @Date: Created in 2018/3/30 15:32
 * @Version: V1
 * @Description: AES 是一种可逆加密算法，对用户的敏感信息加密处理 对原始数据进行AES加密后，在进行Base64编码转化；
 */
public class AESOperator {

    /**
     * 加密用的Key 可以用26个字母和数字组成 此处使用AES-128-CBC加密模式，key需要为16位。
     */
//    private String sKey = "asdmon7859xo1230";
    private String ivParameter = "pd859kjz10cem3lu";
    public final static String passKey="a1dmons859xo1250";

    private static AESOperator instance = null;

    private AESOperator() {

    }

    public static AESOperator getInstance() {
        if (instance == null) {
            instance = new AESOperator();
        }
        return instance;
    }

    /**
     * 加密
     * @param encData
     * @param secretKey
     * @param vector
     * @return
     * @throws Exception
     */
    public static String encrypt(String encData, String secretKey, String vector) throws Exception {
        if(secretKey == null) {
            return null;
        }
        if(secretKey.length() != 16) {
            return null;
        }
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        byte[] raw = secretKey.getBytes();
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        //使用CBC模式，需要一个向量iv，可增加加密算法的强度
        IvParameterSpec iv = new IvParameterSpec(vector.getBytes());
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
        byte[] encrypted = cipher.doFinal(encData.getBytes("utf-8"));
        // 此处使用BASE64做转码。
        return new BASE64Encoder().encode(encrypted);
    }

    /**
     * 加密
     * @param sSrc
     * @return
     * @throws Exception
     */
    public String encrypt(String sSrc, String skey) throws Exception {
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        byte[] raw = skey.getBytes();
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        // 使用CBC模式，需要一个向量iv，可增加加密算法的强度
        IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
        byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
        // 此处使用BASE64做转码。
        return new BASE64Encoder().encode(encrypted);
    }

    // 解密
    public String decrypt(String sSrc, String skey) throws Exception {
        try {
            byte[] raw = skey.getBytes("ASCII");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
            // 先用base64解密
            byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);
            byte[] original = cipher.doFinal(encrypted1);
            String originalString = new String(original, "utf-8");
            return originalString;
        } catch (Exception ex) {
            return null;
        }
    }

    public String decrypt(String sSrc,String key,String ivs) throws Exception {
        try {
            byte[] raw = key.getBytes("ASCII");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            IvParameterSpec iv = new IvParameterSpec(ivs.getBytes());
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
            byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);// 先用base64解密
            byte[] original = cipher.doFinal(encrypted1);
            String originalString = new String(original, "utf-8");
            return originalString;
        } catch (Exception ex) {
            return null;
        }
    }

    public static String encodeBytes(byte[] bytes) {
        StringBuffer strBuf = new StringBuffer();
        for (int i = 0; i < bytes.length; i++) {
            strBuf.append((char) (((bytes[i] >> 4) & 0xF) + ((int) 'a')));
            strBuf.append((char) (((bytes[i]) & 0xF) + ((int) 'a')));
        }
        return strBuf.toString();
    }

    public static void main(String[] args) throws Exception {
//        // 需要加密的字串
////        String cSrc = "[{\"request_no\":\"1001\",\"service_code\":\"FS0001\",\"contract_id\":\"100002\",\"order_id\":\"0\",\"phone_id\":\"13913996922\",\"plat_offer_id\":\"100094\",\"channel_id\":\"1\",\"activity_id\":\"100045\"}]";
//
//
//        // 加密
        long lStart = System.currentTimeMillis();
////        String enString = AESOperator.getInstance().encrypt(cSrc);
////        System.out.println("加密后的字串是：" + enString);
        long lUseTime = System.currentTimeMillis() - lStart;
////        System.out.println("加密耗时：" + lUseTime + "毫秒");
//
        String str="5KQwrPbwdL6PhXujxW37FSSQZ1JiwsST4cqQzDeyXtP79zkvFD3";
        String enStr=AESOperator.getInstance().encrypt(str,passKey);
        System.out.println("加密1："+enStr);

        // 解密
        lStart = System.currentTimeMillis();
        String DeString = AESOperator.getInstance().decrypt("Qw6ynkPGXRZ4OSva91t5fgIXi5DB3UMWbcn6PtUprHR8zIxrbS6/rB3ijL4/CX0R9dHDJ9UwNncmkA0KhINvLvokO2MHC+fTcq8ndn0t7+8=", "asdmon7859xo1230");
        System.out.println("解密后的字串是：" + DeString);
        lUseTime = System.currentTimeMillis() - lStart;
        System.out.println("解密耗时：" + lUseTime + "毫秒");
    }
    
    public static String hmacSHA256(byte[] data, byte[] key) {
          try  {
             SecretKeySpec signingKey = new SecretKeySpec(key, "HmacSHA256");
             Mac mac = Mac.getInstance("HmacSHA256");
             mac.init(signingKey);
             return byte2hex(mac.doFinal(data));
          } catch (NoSuchAlgorithmException e) {
             e.printStackTrace();
          } catch (InvalidKeyException e) {
            e.printStackTrace();
          }
          return null;
    } 

    public static String byte2hex(byte[] b) {
        StringBuilder hs = new StringBuilder();
        String stmp;
        for (int n = 0; b!=null && n < b.length; n++) {
            stmp = Integer.toHexString(b[n] & 0XFF);
            if (stmp.length() == 1)
                hs.append('0');
            hs.append(stmp);
        }
        return hs.toString().toUpperCase();
    }
}
